Cocke Co. TN McGaha question

Do any of you McGaha researchers know why the name Seaton appears in some of the McGaha names? I've seen it a few times, and my Grandfather also had it as one of his middle names. His name was James Benjamin Seaton McGaha, born Aug. 1884 to William Russell McGaha and Mary Nix. Does anyone have a clue why this name is used in the McGaha line?